Johnnie is a slimy, small-time music promoter and talent scout who notices teenage girls going crazy for the singing and bongo playing of talentless and seemingly idiotic Herbert Rudge. Johnnie rechristens Rudge as "Bongo Herbert" and signs him to a contract that gives Johnnie a 50% share of the profits. With Johnnie's help, Bongo rockets to stardom. Bongo's success attracts a host of sleazy music industry types intent on exploiting him. Johnny quickly finds himself outclassed in the sleaze department as Bongo turns out to be the slipperiest slime of them all.